JPH1198571A - Communication method, transmission method, reception method, base station and terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain efficiency in setting a control channel by fixing a frequency channel where an initial pickup channel exists and also a time slot by which initial pickup information is transmitted is set by means of a random number. SOLUTION: Only the initial pickup channel ICH is transmitted in the frequency channel in a first band slot and the 17-th band slot. The initial pickup channel ICH is data to be transmitted once to 16 time slots in average for one time slot period and the transmission time slot is set by the random number which is generated in a base station. For example, even when the same frequency is used in the base station of an adjacent cell so as to execute initial picking-up, a probability where the transmissions of the initial pickup channels ICH from the respective base stations are superimposed is drastically reduced, a control channel is shared in the respective cells and frequency configuration in the respective cells is made to be common. In this case, the synchronization of the base stations of the respective cells is not required and the respective base stations can be operated by asynchronization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method, a transmission method and a reception method suitable for application to, for example, a cellular radio telephone system, and to a base station and a terminal device based on these methods. (Time Division Mu
ltiplex Access system: time division multiple access system). .

[0002]

2. Description of the Related Art Various wireless telephone systems for wirelessly transmitting digital data signals have been put into practical use. A system to which the TDMA system is applied has been put to practical use as one of the systems that can be connected efficiently. In this method, one transmission band (frequency channel) is divided on the time axis to form time slots, and each time slot is assigned to a plurality of terminal devices, and a plurality of terminal devices are transmitted to a base station in one transmission band. It is one that can be connected.

FIG. 8 is a diagram showing an example of a channel configuration of a downlink transmitted from a base station to a terminal device side in a cellular radio telephone system to which a conventional TDMA system is applied.
The vertical axis indicates frequency, and the horizontal axis indicates the passage of time. On the frequency axis, one band slot is formed for each predetermined frequency band (for example, every several KHz), and a number (here, a continuous number) is assigned to each band slot. On the time axis, one time slot is formed every predetermined time (for example, every several hundred microseconds), and a number (here, a continuous number) is assigned to each time slot.

In the example shown in FIG. 8, 16 band slots are set to 1
Are set as transmission bands controlled by one control channel, and a first band slot for every 16 band slots,
The 17th band slot # and the control channel CCH (Co
mmom Control Channel). In this band slot for the control channel CCH, all time slots are occupied by the control channel.

[0005] Then, 15 band slots (for example, 2nd to 16th band slots) following each control channel.
Is a transmission band of an information transmission channel TCH (Traffic Channel) for transmitting voice for speech and various data.
The setting of the information transmission channel TCH in this transmission band is
Each base station is notified by a control channel from the base station. Therefore, when each terminal device connects to the base station,
First, a band slot in which the control channel CCH is transmitted is received, and from the control information indicated by the control channel CCH transmitted in the band slot, a band slot and a time slot assigned to the terminal device are determined. The communication with the base station in the band slot and the time slot is started.

For example, in a configuration in which one band slot (frequency channel) is divided into four to communicate with four terminal devices, each terminal device has four time slot periods (uplink uses another band. Communication is performed. FIG. 8 shows a communication state of a certain terminal device.
Here, the time slot number 1,
5, 9, 13}, the information transmission channel TC
H communication is performed with the base station.

[0007]

SUMMARY OF THE INVENTION In this way, the TDM
The wireless communication in the case where the A method is applied is performed, but the frequency channel allocated to the control channel CCH includes:
Basically, there is no interference wave in the area (cell) of the base station. Therefore, it is difficult to share the frequency of the control channel with the base stations of the adjacent cells because the signals of the control channel mutually interfere between the base stations.

When the time slot period is synchronized between base stations by some method, for example, the time slot period in a band slot used as a control channel CCH is divided and used by adjacent base stations. Thus, the frequency channel for the control channel can be shared between the base stations. However, in order to synchronize the respective base stations, some kind of synchronization data is transmitted between the respective base stations, or a signal (such as a positioning signal for GPS) which is used as a reference is received by the respective base stations, and the synchronization processing is performed. And the configuration and processing of the base station become complicated.

In the case of a wireless telephone system, the position of a terminal device is not constant. Therefore, if the frequency channel used as a control channel is a fixed channel, the condition of a transmission line at that time may cause a problem. The communication condition may not be good. In order to avoid this problem, if a plurality of frequency channels are used for the control channel, a frequency diversity effect is obtained, and the possibility of good communication increases. However, if a plurality of control channel frequencies are prepared in the conventional system configuration as shown in FIG. 8, the number of frequency channels that can be used as the information transmission channel TCH decreases, which is not preferable.

[0010] In view of the above, it is an object of the present invention to enable a control channel to be set efficiently in each base station.

[0011]

In order to solve this problem, the present invention provides a channel transmitted from a base station.
In addition to a channel for information communication with the terminal device, a channel group for control information communication is provided, and among the group of control information communication channels, a frequency channel in which an initial acquisition channel exists is fixed to a predetermined frequency channel. In the frequency channels assigned to the initial acquisition channel, a time slot in which the initial acquisition information is transmitted is set by a predetermined random number sequence, and the information of the set random number is stored in the transmitted initial acquisition information. A time slot in which an initial acquisition channel is transmitted is determined based on a random number obtained by receiving a frequency channel in which an initial acquisition channel exists in a terminal device.

By performing such processing, when synchronizing with the base station on the terminal device side, a frequency channel in which an initial acquisition channel exists is received, and a random number stored in the initial acquisition information is determined. Even if the transmission of the time slot of the initial acquisition channel from the base station is intermittent, the terminal device can determine the time slot in which the subsequent initial acquisition channel exists.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

In this embodiment, the present invention is applied to a cellular radio telephone system. First, the configuration of a communication system to which this embodiment is applied will be described. The configuration of the communication method in this example is
Basically, there is a system in which communication is performed by the TDMA system, but a signal transmitted in each time slot is a multicarrier signal. That is, there is a so-called multi-carrier system in which a plurality of subcarriers are continuously arranged in a band (Band) allocated in advance, and a plurality of subcarriers in one band are simultaneously used in one transmission path (path). In addition, a plurality of subcarriers within one band are collectively divided by time (Division) and modulated. Here, band division multiple access (BDMA: Band Divis
ion Multiple Access) method.

The configuration of the connection method will be described below. FIG. 3 is a diagram showing the slot configuration of the transmission signal of the present embodiment, in which the vertical axis represents frequency and the horizontal axis represents time. In the case of the present example, an orthogonal basis obtained by dividing the frequency axis and the time axis into a lattice is provided. That is, one transmission band (one band slot) is set to 150 KHz,
24 subcarriers are arranged in one transmission band of 0 KHz. These 24 subcarriers are 6.25 kHz
Subcarrier numbers from 0 to 23 are assigned to each carrier continuously at equal intervals. However, there are actually 22 subcarriers from subcarrier numbers 1 to 22, and subcarrier numbers 0 and 23 at both ends in one band slot are guard bands in which no subcarriers are set. Is set to 0. Then, data is transmitted using, for example, a phase difference of each of the 22 subcarriers.

One band slot configured in this way has 32 consecutive 32 band slots as one transmission unit on the frequency. That is, as shown in FIG.
Continuous 32 band slots are used as one transmission unit on the frequency, and in each band slot, as shown in FIG. 4B, 22 multicarrier signals are used for transmission. And frequency channels for every 16 band slots (that is, two frequency channels for each transmission unit)
Are used as channels for transmitting control information. Details of the transmission configuration of the control information will be described later.

Returning to FIG. 3, the structure of the time axis will be described.
One time slot is defined at intervals of 200 μsec, and a burst signal is modulated and transmitted to 22 subcarriers for each time slot. Here, a state in which 16 time slots are arranged is defined as one frame. Continuous time slot numbers are assigned to 16 time slots in one frame. The range indicated by hatching in FIG. 3 indicates one time slot section of one band slot.

Using the orthogonal base obtained by dividing the frequency axis and the time axis in a grid pattern, the base station performs multiple access for communicating with a plurality of terminal devices at the same time. Here, the band slot for communication between the base station and each terminal device is 1
Every time a band slot communication is performed, a frequency switching process called frequency hopping for switching to another band slot is performed at the next communication. That is, for example, since communication between the base station and each terminal device is performed at a predetermined time slot interval, a frequency channel (band) for transmission and reception is used in a communication system circuit using a time slot period in which no communication is performed on the terminal device side. Slot). This band slot switching is performed within one unit of the transmission frequency shown in FIG. 4 (that is, within 32 band slots). By performing the frequency hopping, for example, a plurality of band slots prepared in one base station can be used equally by a plurality of terminal devices connected to the base station. Although FIGS. 3 and 4 describe only the configuration of the downlink, the same applies to the configuration of the uplink performing communication from each terminal device to the base station. However, different transmission bands are used for the downlink and the uplink (for example, downlink 2.x).
(0 GHz band, uplink 2.2 GHz band).

By setting the communication state as described above, the signal transmitted between each terminal device and the base station is in a state where orthogonality is maintained with respect to other signals, and other signals are transmitted. , It is possible to satisfactorily extract only the corresponding signal without receiving the interference. Then, since the band slot to be transmitted is switched at any time by frequency hopping, the transmission band prepared for each base station is effectively used, and efficient transmission can be performed. In this case, as described above, the frequency band to be assigned to one base station (cell) can be freely assigned, so that the system can be freely set according to the situation in which it is used.

Next, the configuration of a base station that communicates with a terminal device in the system configuration described above will be described with reference to FIG.

FIG. 1 is a block diagram showing the overall configuration of a base station according to the present embodiment.
2, and converts a signal of a predetermined frequency band received by the antenna 11 (the frequency band here is a signal of one transmission unit composed of 32 band slots) into an intermediate frequency signal. The signal is converted to an analog / digital converter 13
After the conversion into digital data by the
To supply. The modulation / demodulation processing unit 14 demodulates the supplied intermediate frequency signal. The demodulation processing here is
For example, 2 described in the above-described transmission method (BMDA method)
A demodulation process such as an orthogonal transform is performed to convert the data distributed and modulated to two subcarriers and transmitted, into one series of data. Then, the demodulated data is supplied to the demultiplexer 15 and separated into data transmitted from each terminal device.
6a, 16b ‥‥ 16n (n is an arbitrary number).
At the time of separation by the demultiplexer 15, the frequency position (band slot) to be separated is changed as needed in consideration of the above-described frequency hopping and supplied to each of the decoders 16a to 16n.

The number of decoders 16a to 16n corresponding to the number of terminal devices that can be simultaneously connected to one base station is prepared, and each decoder 16a to 16n performs a decoding process of data supplied from the terminal device. Then, the data decoded by each of the decoders 16a to 16n is supplied to another communication system (not shown) connected to the base station, and transmitted to the other party connected to the terminal device via the telephone line. . However, control data such as a connection request transmitted from the terminal device to the base station is decoded by any of the decoders 16a to 16n, and then decoded by the control unit 2 of the base station.
Supply 0.

Next, the configuration of the transmission system of the base station will be described. For each terminal device to be connected, data transmitted from an individual partner to the base station is transmitted to a separate encoder 1.
7a, 17b ‥‥ 17n (n is an arbitrary number).
Each of the encoders 17a to 17n has 1
A plurality of terminals corresponding to the number of terminal devices that can be simultaneously connected to one base station are prepared, and encoding processing of data supplied by each of the encoders 17a to 17n is performed. Then, the data encoded by each of the encoders 17a to 17n is supplied to the multiplexer 18, and all the transmission data handled by this base station is converted into one transmission data and supplied to the modulation / demodulation processing unit 14. The modulation / demodulation processing unit 14 converts the supplied data into 22
The digital / analog converter 19 supplies the modulated data to the high-frequency circuit 12 as an analog signal by performing a process of dispersing and modulating the subcarriers. Is a signal of one transmission unit composed of 32 band slots).
Radio transmission is performed from the antenna 11. Control data transmitted from the control unit 20 of the base station to the terminal device is also supplied to any of the encoders 17a to 17n and encoded, and then transmitted by the transmission system from the multiplexer 18 to the high-frequency circuit 12. Transmission processing and wireless transmission.

The base station performs radio communication with the terminal device in the configuration described above, and the communication control is performed by the control unit 20 of the base station. The control unit 20 is configured by control means such as a microcomputer, and controls communication with each terminal device by wirelessly transmitting the control data generated by the control unit 20 to the terminal device side.
A random number sequence used in a control information transmission process described later is also generated by a random number generation unit (not shown) in the control unit 20. The random number generation unit uses, for example, a circuit (such as an M-sequence shift register) that generates a PN code of a predetermined number of bits (for example, 16 bits), and determines the phase (leading bit position) of the generated PN code. The configuration is such that the random number to be generated is changed by changing it at any time.

Next, the configuration of a terminal device for performing wireless communication with the base station will be described with reference to FIG.

FIG. 2 is a block diagram showing the overall configuration of the terminal device of the present embodiment. A transmitting / receiving antenna 31 is connected to a high-frequency circuit 32, and a signal of a predetermined frequency band received by the antenna 31 (here, Is converted to an intermediate frequency signal, the analog / digital converter 33 converts the intermediate frequency signal into digital data, and supplies the digital data to a modulation / demodulation processing unit 34. The modulation / demodulation processing unit 34 demodulates the supplied intermediate frequency signal.
As the demodulation processing here, for example, demodulation processing such as orthogonal transform that converts data transmitted by being dispersed and modulated into 22 subcarriers described in the above-described transmission method (BMDA method) into one-series data I do. Then, the demodulated data is supplied to the decoder 35, and decoding of data transmitted from the base station is performed. The data decoded by the decoder 35 is transmitted to the audio processing system circuit 36.
, And processes the voice data for communication, and the obtained voice signal is emitted from the speaker 37. When the decoded data is control data from the base station, the data is supplied to the control unit 41 of the terminal device.

Next, the configuration of the transmission system of the terminal device will be described. If the data to be transmitted is voice for communication, the voice signal picked up by the microphone 38 is supplied to the voice processing system circuit 36, and the data is transmitted to the voice processing system circuit 36. After that, the audio data is supplied to the encoder 39 to perform an encoding process and the like. Then, the data encoded by the encoder 39 is supplied to the modulation / demodulation processing unit 34. The modulation / demodulation processing unit 34 performs processing of dispersing the supplied data into 22 subcarriers and modulating the data, and supplies the modulated data as an analog signal to the high-frequency circuit 32 by the digital / analog converter 40. The signal is frequency-converted into a signal in a predetermined frequency band, and transmitted from the antenna 31 by radio. In addition,
Control data such as a connection request transmitted from the control unit 41 of the terminal device to the base station is also supplied to the encoder 39 and encoded, and then transmitted in the transmission system from the modulation / demodulation processing unit 34 to the high-frequency circuit 32. And transmitted wirelessly.

The reception state and the transmission state of the terminal device are controlled by a control unit 41 constituted by control means such as a microcomputer. The control unit 41 determines control data transmitted from the base station, and determines a frequency channel (band slot) for transmission / reception and timing of transmission / reception on the frequency channel (ie, a time slot for transmission and reception). , So that each unit in the terminal device is controlled to perform the corresponding process. The control unit 4
1 is configured to receive operation information from a key 42 such as a dial key. Further, a display unit 43 composed of a liquid crystal display panel or the like is connected to the control unit 41, and displays an operation state and the like.

Although the terminal device shown in FIG. 2 has been described as transmitting and receiving voice data for communication, it may be configured as a terminal device for transmitting or receiving other various data. For example, the terminal device may be configured to transmit or receive some character data or numeric data, or to transmit or receive data such as electronic mail or the Internet.

Next, a state in which communication is performed between the base station having the above-described configuration and the terminal device will be described with reference to FIGS. FIG. 5 is a diagram showing the channel configuration of one transmission band (32 band slots) of the downlink to the terminal device handled by the base station in this example, where the vertical axis indicates the frequency by the band slot number, and the horizontal axis indicates Indicates the lapse of time by a time slot number, and consecutive numbers are given to the band slot and the time slot.

Here, one of the 16 band slots (ie, the first band slot and the seventeenth band slot) is used as a dedicated channel for control information communication. However, in the case of this example, an initial acquisition channel IC is used as a control information channel group transmitted from the base station.
H (Initial acquisition Channel) and a broadcast channel BCH (Broadcast Channel) are prepared, and only the initial acquisition channel ICH is transmitted in the frequency channels of the first band slot and the seventeenth band slot. In other band slots (the 2nd to 16th band slots and the 18th to 32nd band slots), transmission of the broadcast channel BCH and transmission of the information transmission channel TCH are performed.

The initial acquisition channel ICH transmitted in the first band slot and the seventeenth band slot dedicated to control information communication is not transmitted in all time slots, but is transmitted once every 16 time slots on average. The time slot to be transmitted is set by a random number using a random number sequence generated by the control unit 20 of the base station, which is data transmitted for one time slot.

In the example of FIG. 5, in the frequency channel of the first band slot, during the first 16 time slots (between time slot numbers 1 to 16), the band slot number 14 and the initial acquisition channel ICH are used. Data is transmitted from the base station, and during the next 16 time slots (from time slot number 17 to number 32), the data of the initial acquisition channel ICH is transmitted from the base station at band slot number 24, and 16 time slot periods (time slot number 33 to number 4
8), the data of the initial acquisition channel ICH is transmitted from the base station at the band slot number 35.

As the data of the initial acquisition channel ICH during one time slot, in addition to the synchronization data necessary for the terminal device to acquire the data of the initial acquisition channel ICH, the broadcast channel B
The data of the band slot number where the CH is transmitted and the data of the time slot number where the initial acquisition channel ICH is transmitted next are given. The data of the band slot number at which the broadcast channel BCH is transmitted next and the data of the time slot number at which the initial acquisition channel ICH is transmitted next are stored in the control unit 2 of the base station.
It is generated using random numbers based on the random number sequence generated within 0.

Here, the broadcast channel BC
H is 2 of the period during which the initial acquisition channel ICH is transmitted.
The broadcast channel BC is transmitted after the time slot, and is transmitted at that timing.
H is the initial acquisition channel ICH
Is indicated by the data of the random number assigned to. The broadcast channel BCH transmitted from the transmission system of the base station is
Needless to say, the band slot is actually set to the band slot indicated by the random number data. The data transmitted on the broadcast channel BCH includes various data that needs to be transmitted to the terminal device. That is, the information transmission channel TC necessary for setting the wireless communication line
Various kinds of information such as H allocation information, various kinds of information necessary for releasing a line, and various kinds of information necessary for handoff for switching to communication with another base station are transmitted. However, in the case of this example, even if the terminal device cannot receive the data of the broadcast channel BCH for a relatively short period of about one time slot, the data transmitted on the broadcast channel BCH is configured so that there is no problem. It is.

As the data of the transmission time slot number of the next initial acquisition channel ICH included in the initial acquisition channel ICH, data of the time slot period until the next transmission of the initial acquisition channel ICH is indicated. Initial acquisition channel I transmitted next from the transmission system
Of course, the channel is actually set at the timing indicated by the data of the random number.

FIG. 6 shows a PN code generated in the control unit 20 on the base station side, data of the period (transmission interval) of the initial acquisition channel ICH, and the broadcast channel BC.
7 is a diagram illustrating an example of correspondence with data of an H band slot (transmission frequency). Each time data of an initial acquisition channel ICH is transmitted, the head position of a 16-bit PN code, which is a random number sequence, is shifted by one bit. Is performed,
The shifted 16-bit data is given to the initial acquisition channel ICH as random number data.

The data of a predetermined bit position in the 16-bit random number data indicates the position of the transmission time slot of the next initial acquisition channel ICH, and the data of another predetermined bit position indicates the band slot of the broadcast channel BCH. Is indicated.

In the example of FIG. 5, data a11, a12, and a13} of the transmission interval of the next initial acquisition channel ICH are sequentially added to each time slot period of the initial acquisition channel ICH transmitted to band slot number 1. And the broadcast channel BCH transmitted two time slots after each initial acquisition channel ICH
Is the data b of the frequency interval with the band slot in which
11, b12, b13} are sequentially added. Similarly,
During each one time slot period of the initial acquisition channel ICH transmitted to the band slot number 17, data a21, a22, a of the transmission interval of the next initial acquisition channel ICH
23} are sequentially given, and data b21, b22, b23} of the frequency interval with the band slot in which the broadcast channel BCH transmitted after two time slots of each initial acquisition channel ICH is transmitted.
Are sequentially provided.

As for an information transmission channel TCH for transmitting various data between the base station and the terminal device, as shown in FIG. 5, one example (communication between the base station and one terminal device) is shown in FIG. One time slot period is set in four time slot periods, and the band slot is configured to use a different band slot for each time slot period according to a predetermined rule by a frequency hopping process. The slots and the 18th to 32nd band slots are used equally. For the band slot in which the broadcast channel BCH is transmitted, a maximum of 15
A position apart from the band slot (for example, the frequency position of the broadcast channel BCH indicated by the initial acquisition channel ICH transmitted in the first band slot is any one of the second band slot to the sixteenth band slot)
There is.

By transmitting control information from a base station to a terminal device with such a configuration and processing, control information can be efficiently transmitted to each terminal device. That is, the terminal device to be connected to the base station first receives a band slot in which the initial acquisition channel ICH is transmitted, and when the initial acquisition channel ICH can be acquired, the data of the random number included in the initial acquisition channel ICH. Thus, the slot position where the broadcast channel BCH is transmitted can be determined, and the broadcast channel BCH can be received and the corresponding control process can be performed. Further, the timing at which the initial acquisition channel ICH is transmitted next is also known.

If the terminal device is provided with the same circuit (such as a shift register) as a generating circuit for generating a random number sequence at the base station, it receives the initial acquisition channel ICH once, and receives the phase of the received random number sequence. Can be determined on the terminal device side, and thereafter, without actually receiving the initial acquisition channel ICH, the random number included in the initial acquisition channel ICH can be estimated at each timing by the random number generated by the circuit, and the broadcast channel BCH The position of the slot where is transmitted is known, and control data can be received correctly.
It can be synchronized with the base station.

Here, the random number sequence generated by the base station is
If there are a plurality of types in this wireless telephone system, the data of the type of the circuit used to generate the random numbers is added to the data of the random numbers transmitted from the base station, so that the terminal device generates the synchronized random numbers. Similarly, at each timing, the random number included in the initial acquisition channel ICH can be estimated, and can be synchronized with the base station.

In this example, the transmission of the initial acquisition channel ICH is performed at a randomly set timing within the band slot prepared for the initial acquisition channel ICH. Even when the initial acquisition channel ICH is performed using the same frequency, the possibility that the transmission of the initial acquisition channel ICH from each base station overlaps is very low, and the control channel can be shared by each cell. Can be shared. In this case, there is no need to synchronize the base stations of each cell, and each base station can be operated asynchronously.

The broadcast channel BCH
And the information transmission channel TCH are transmitted in the same band. For example, in the example of FIG.
H and the information transmission channel TCH overlap, but such an overlap is stochastically small, so that it does not cause much problem in actually operating the system.

In the example of FIG. 5, the number of band slots in one transmission band is set to 32, and control data is transmitted once every 16 time slots on average. However, control data is transmitted at other intervals. It is good also as a structure which performs. in this case,
If the interval between control data is not fixed by the base station,
Data indicating the appearance frequency of the control data may be added to the initial acquisition channel ICH so that the terminal device can determine the frequency channel in which the initial acquisition channel ICH exists.

When a plurality of band slots for an initial acquisition channel ICH are prepared in one base station (for example, the first band slot and the seventeenth band slot in FIG. 5), a random number used in each ICH band slot is used. It is preferable to offset the phase of the sequence (such as the leading bit position) for each frequency position (band slot). By doing so, transmission of control data such as ICH in each band slot becomes uniform, and control data can be transmitted satisfactorily.

Next, a second embodiment of the present invention will be described with reference to FIG. In the case of the second embodiment,
The configuration for transmitting control data from the base station is different from that of the first embodiment, and the other configuration is the same as that of the first embodiment, and a description thereof will be omitted.

FIG. 7 shows one transmission band (32 band slots) of the downlink to the terminal device handled by the base station in this example.
In the figure, the vertical axis indicates the frequency by the band slot number, the horizontal axis indicates the lapse of time by the time slot number, and the band slot and the time slot are numbered consecutively.

Also in this case, one of the 16 band slots (ie, the first band slot and the seventeenth band slot) is used as a channel dedicated to the initial acquisition channel ICH, and the other band slots (second to sixteenth band slots) are used.
In the band slot and the 18th to 32nd band slots), transmission of the broadcast channel BCH and transmission of the information transmission channel TCH are performed.

The initial acquisition channel ICH transmitted in the first band slot and the seventeenth band slot dedicated to control information communication is similar to that of the first embodiment.
The data is transmitted once every 16 time slots for one time slot on average, and the time slot to be transmitted is set by a random number using a random number sequence generated by the control unit 20 of the base station.

Here, in the case of this example, data indicating the time slot position where the initial acquisition channel ICH is transmitted is added to the data indicated by the random number, and in this case, the data from the beginning of one frame is added. Indicates the interval. That is, here, one frame is configured with 16 time slots as one unit, and the data of each initial acquisition channel ICH is used to transmit the time slot position at which the initial acquisition channel ICH is transmitted within one frame (see FIG. 7). Data a
51, a52, a53, a54}). The data on the frequency position of the broadcast channel BCH is the same as in the first embodiment described above.

With this configuration, the frame timing can be detected only by the terminal device receiving the initial acquisition channel ICH once, and the frame synchronization can be easily performed. Then, by synchronizing the random number sequence generating means provided on the terminal device side with the random number on the base station side, the positions of the subsequent initial acquisition channel ICH and broadcast channel BCH can be determined, and in the case of the first embodiment Communication control similar to that described above can be performed, and similar effects can be obtained.

In the above-described embodiment, details of the communication configuration, frame configuration, and the like are shown by way of example, and the present invention is not limited to the above-described embodiment. In particular, in the above-described embodiment, the present invention is applied to the transmission of a multi-carrier signal, but the control processing of the present invention can be applied to various communications of the TDMA system that performs frequency hopping. In the above-described embodiment, the present invention is applied to a cellular wireless telephone system, but can be applied to control of other communication systems.

[0055]

According to the communication method described in claim 1,
Of the control information communication channel group, the frequency channel in which the initial acquisition channel exists is fixed to a predetermined frequency channel, and the time at which the initial acquisition information is transmitted among the frequency channels assigned to the initial acquisition channel is set. The slot is set by a predetermined random number sequence, and the process of storing and transmitting the set random number information in the transmitted initial acquisition information is performed. By receiving the frequency channel in which the initial acquisition channel exists and determining the random number stored in the initial acquisition information, even if the transmission of the time slot of the initial acquisition channel from the base station is intermittent, The terminal device can determine the time slot in which the acquisition channel exists, and the control information channel can be shared by multiple cells. Even if the transmission of the intermittent control information for an equal, in each terminal apparatus can be synchronized to the base station.

According to the communication method of the present invention, a plurality of frequency channels in which the initial acquisition information exists are arranged at equal frequency intervals in the transmission frequency band allocated to the base station, and time slots are set. By offsetting the phase of the predetermined random number sequence for each frequency channel, the use state of all the frequency channels in which the initial acquisition information exists becomes uniform, and control information can be transmitted satisfactorily.

According to the communication method of the present invention, the terminal device sets the frequency channel or the time slot in which the broadcast channel of the control information communication channel group exists by using the random number stored in the initial acquisition channel. By receiving the initial acquisition information, the side knows the frequency channel or time slot position of the broadcast channel. Even if the process of changing the frequency channel or time slot position of the broadcast channel is performed, the broadcast channel can be properly received.

According to the communication method of the fourth aspect, the information indicating the appearance frequency of the initial acquisition channel is added to the initial acquisition information of the initial acquisition channel, and the terminal device receives the frequency channel on which the initial acquisition channel exists. By using the information indicating the appearance frequency obtained from this, it is possible to determine all the frequency channels in which the initial acquisition channels exist, thereby coping with a communication system with a variable number of channels for each base station. it can.

According to the communication method of the present invention, a plurality of subcarrier signals are arranged in one frequency channel as a signal transmitted from the base station in a time slot, and the signals are distributed to the plurality of subcarrier signals. By performing a process of demodulating information modulated into information into a plurality of subcarrier signals in a terminal device as a multicarrier signal in which information is modulated, transmission control by the multicarrier signal can be efficiently performed.

According to the transmission method described in claim 6 and the base station described in claim 15 to which the transmission method is applied,
Of the control information communication channel group, the frequency channel in which the initial acquisition channel exists is fixed to a predetermined frequency channel, and the time at which the initial acquisition information is transmitted among the frequency channels assigned to the initial acquisition channel is set. A slot is set by a predetermined random number sequence, and a process of storing the set random number information in the transmitted initial acquisition information and performing transmission is performed, so that the control information receiving side has an initial acquisition channel. By receiving the frequency channel to be used and determining the random number stored in the initial acquisition information, even if the transmission of the time slot of the initial acquisition channel is intermittent, the time slot in which the subsequent initial acquisition channel exists is determined by the terminal. Can be judged on the device side,
By setting the time slot of the initial acquisition channel at intermittent timing, the channel for control information can be shared by a plurality of cells.

According to the transmission method described in claim 7 and the base station described in claim 16 to which the transmission method is applied,
The frequency channels in which the initial acquisition channels exist are arranged at equal frequency intervals in the transmission frequency band allocated to the own station, and the phase of a predetermined random number sequence for setting a time slot is offset for each frequency channel. As a result, the use states of all the frequency channels in which the initial acquisition information prepared for each base station exists are equalized, and the control information can be transmitted well.

According to the transmission method described in claim 8 and the base station described in claim 17 to which this transmission method is applied,
Since the frequency channel or the time slot transmitted as the broadcast channel of the control information communication channel group is indicated by a random number, the broadcast channel for the control information communication can be assigned to an arbitrary frequency channel or time slot. , It is possible to transmit control information at random frequencies or time slots.

According to the transmission method described in claim 9 and the base station described in claim 18 to which the transmission method is applied,
By providing information indicating the frequency of appearance of the initial acquisition channel to the initial acquisition information of the initial acquisition channel, even if the communication system has a variable number of channels for each base station, the control information Can be dealt with simply by changing the information indicating the appearance frequency of the initial acquisition channel.

According to the transmission method described in claim 10 and the base station described in claim 19 to which this transmission method is applied, a plurality of subcarrier signals are arranged in one frequency channel as a signal transmitted in a time slot. The use of a multicarrier signal in which information is modulated by being dispersed into a plurality of subcarrier signals enables efficient control of transmission using the multicarrier signal.

According to the reception method described in claim 11 and the terminal device described in claim 20 to which this reception method is applied, time slots delimited at predetermined time intervals are formed, and a predetermined number of time slot periods are used. In a receiving method in which a frequency channel for performing intermittent reception and a frequency channel for performing this reception changes to a predetermined state in time slot units, a channel group for control information reception other than an information reception channel is used as a reception channel. The control information receiving channel group includes a frequency channel in which the initial acquisition channel exists, a predetermined frequency channel, and a time at which the initial acquisition channel is transmitted based on a random number included in the received frequency channel. By determining the slot, the time of the initial acquisition channel from the base station can be determined. Also the transmission of Tsu door is an intermittent,
The time slot in which the subsequent initial acquisition channel exists can be determined.

According to the receiving method described in claim 12 and the terminal device according to claim 21 to which the receiving method is applied, a broadcast channel is determined based on a random number obtained by receiving a frequency channel in which an initial acquisition channel exists. By judging the frequency channel or time slot in which the broadcast channel exists, the broadcast channel can be determined only by the reception of the initial acquisition channel, and good reception can be achieved even when the transmission frequency and time slot position of the broadcast channel change randomly.

According to the receiving method described in claim 13 and the terminal device according to claim 22 to which the receiving method is applied, the information indicating the appearance frequency obtained by receiving the frequency channel in which the initial acquisition channel exists is represented by: By judging all frequency channels in which the initial acquisition channels exist, the receiving side can cope with a communication system in which the number of channels and the like are variable on the transmitting side.

According to the receiving method described in claim 14 and the terminal device according to claim 23 to which the receiving method is applied, a plurality of subcarrier signals in one frequency channel are received and the plurality of subcarrier signals are received. By performing the process of demodulating the information that has been dispersed and modulated, the control of reception by the multicarrier signal can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a base station according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a terminal device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a slot configuration of a transmission signal according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a band slot arrangement according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a channel configuration according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an example of control channel data according to the first embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a channel configuration according to a second embodiment of the present invention.

FIG. 8 is an explanatory diagram showing an example of a conventional cellular channel configuration.

[Explanation of symbols]

12 high frequency system circuit, 14 modulation / demodulation processing circuit, 15 demultiplexer, 16a to 16n decoder, 17a to
17n encoder, 18 multiplexer, 20 control unit, 32 high frequency system circuit, 34 modulation / demodulation processing circuit, 3
5 Decoder, 36 Audio circuit, 39 Encoder,
41 ... Control unit

Claims (23)

[Claims] 1. A time slot delimited every predetermined time is formed, and communication is performed intermittently between a base station and an arbitrary number of terminal devices at a predetermined number of time slot periods. In a communication method in which a frequency channel for performing a change in a predetermined state in a time slot unit, a channel group for control information communication is provided as a channel transmitted from the base station, in addition to a channel for information communication with the terminal device. Of the control information communication channel group, the frequency channel in which the initial acquisition channel exists is fixed to a predetermined frequency channel, and the initial acquisition information is transmitted in the frequency channels allocated to the initial acquisition channel. Time slot is set by a predetermined random number sequence, and the set random number is set in the transmitted initial acquisition information. A communication method for storing the information of the first acquisition channel and determining a time slot in which the initial acquisition channel is transmitted, based on a random number obtained by receiving a frequency channel in which the initial acquisition channel exists in the terminal device. 2. The communication method according to claim 1, wherein a plurality of frequency channels in which the initial acquisition information exists are arranged at equal frequency intervals in a transmission frequency band allocated to the base station. A communication method in which the phase of the predetermined random number sequence for setting a slot is offset for each frequency channel. 3. The communication method according to claim 1, wherein a random number stored in the initial acquisition channel sets a frequency channel or a time slot in which a broadcast channel of a group of channels for control information communication exists, and A communication method for determining a frequency channel or a time slot in which a broadcast channel exists based on a random number obtained by receiving a frequency channel in which the initial acquisition channel exists. 4. The communication method according to claim 2, wherein information indicating the appearance frequency of the initial acquisition channel is added to the initial acquisition information of the initial acquisition channel, and the frequency at which the initial acquisition channel exists in the terminal device. A communication method for judging all frequency channels in which the above-mentioned initial acquisition channel exists, based on information indicating an appearance frequency obtained by receiving a channel. 5. The communication method according to claim 1, wherein a plurality of subcarrier signals are arranged in one frequency channel as a signal transmitted from the base station in the time slot, and the signals are distributed to the plurality of subcarrier signals. A communication method for demodulating information modulated by dispersing the information into a plurality of subcarrier signals in the terminal device. 6. A time slot delimited every predetermined time is formed, intermittent transmission is performed at a predetermined number of time slot periods, and a frequency channel for this transmission changes to a predetermined state in time slot units. In addition to the information transmission channel, a control information transmission channel group is provided as a transmission channel, and a frequency channel in which an initial acquisition channel is present among the control information transmission channel group is defined as a predetermined channel. While fixing to the frequency channel, a time slot in which the initial acquisition information is transmitted is set by a predetermined random number sequence in the frequency channel where the initial acquisition channel exists, and the time slot in which the initial acquisition information is transmitted is set in the initial acquisition information to be transmitted. Transmission method for storing random number information. 7. The transmission method according to claim 6, wherein the frequency channels in which the initial acquisition channels exist are arranged at equal frequency intervals in a transmission frequency band allocated to the own station, and A transmission method for offsetting the phase of the predetermined random number sequence to be set for each frequency channel. 8. The transmission method according to claim 6, wherein a frequency channel or a time slot transmitted as a broadcast channel of a channel group for control information communication is indicated by the random number. 9. The transmission method according to claim 7, wherein information indicating the appearance frequency of the initial acquisition channel is added to the initial acquisition information of the initial acquisition channel. 10. The transmission method according to claim 1, wherein a plurality of subcarrier signals are arranged in one frequency channel as a signal transmitted in the time slot, and information is distributed to the plurality of subcarrier signals. A transmission method using a modulated multicarrier signal. 11. A time slot delimited every predetermined time is formed, intermittent reception is performed at a predetermined number of time slot periods, and a frequency channel for this reception changes to a predetermined state in time slot units. In the receiving method, a channel group for receiving control information is provided in addition to a channel for receiving information as a channel to be received, and a frequency channel in which an initial acquisition channel exists among the group of control information receiving channels is defined as a predetermined channel. A receiving method for receiving on a frequency channel and determining a time slot in which an initial acquisition channel is transmitted from a random number included in the received frequency channel. 12. The receiving method according to claim 11, wherein a frequency channel or a time slot in which a broadcast channel exists is determined based on the random number obtained by receiving a frequency channel in which the initial acquisition channel exists. . 13. The receiving method according to claim 11, wherein all frequency channels in which the initial acquisition channel exists are determined based on information indicating an appearance frequency obtained by receiving a frequency channel in which the initial acquisition channel exists. Receiving method. 14. The receiving method according to claim 11, wherein a plurality of subcarrier signals within one frequency channel are received, and information dispersed and modulated in the plurality of subcarrier signals is demodulated. 15. A time slot delimited every predetermined time is formed, intermittently communicates with a terminal device at a predetermined number of time slot periods, and a frequency channel for performing this communication is defined by a predetermined time slot unit. A base station that performs frequency hopping changing to a state, comprising: an information communication channel processing means; and a control information communication channel processing means, wherein the control information communication processing is performed by the control information communication channel processing means. A channel group includes an initial acquisition channel and a broadcast channel. The initial acquisition channel is fixed to a predetermined frequency channel and transmission processing is performed. The time slot in which the information is transmitted is designated by the control information communication channel. Processing set by a predetermined random number sequence generated by the means, the base station for storing information of random numbers that setting the initial acquisition information to be transmitted. 16. The base station according to claim 15, wherein a plurality of random numbers are simultaneously generated by offsetting a phase of the predetermined random number sequence by the control information communication channel processing means, and the initial acquisition channel exists. A plurality of frequency channels to be transmitted are prepared at equal frequency intervals in the transmission frequency band allocated to the own station, and the initial acquisition information is transmitted in each of the frequency channels in which the plurality of transmitted initial acquisition channels exist. The time slot to be set is individually set by using the plurality of random numbers generated at the same time as the base station. 17. The base station according to claim 15, wherein a frequency channel or a time slot transmitted and processed as a broadcast channel of a control information communication channel group by the control information communication channel processing means is set to the predetermined random number. A base station set according to the sequence. 18. The base station according to claim 16, wherein the control information communication channel processing means adds information indicating the appearance frequency of the initial acquisition channel to the initial acquisition information of the initial acquisition channel. base station. 19. The base station according to claim 15, wherein a plurality of subcarrier signals are arranged in one frequency channel as transmission processing in the information communication channel processing means and the control information communication channel processing means. A base station that performs a process of distributing the information into a plurality of subcarrier signals to convert the information into a multicarrier signal. 20. A time slot delimited every predetermined time is formed to perform intermittent communication at a predetermined number of time slot periods, and a frequency channel for performing this communication changes to a predetermined state in time slot units. A terminal device for performing frequency hopping, comprising: an information communication channel processing means; and a control information communication channel processing means, wherein the control information reception channel processing means includes: Receiving a frequency channel in which the initial acquisition channel exists in a predetermined frequency channel, and determining a time slot in which the initial acquisition channel is transmitted from information of random numbers included in the received frequency channel, Terminal device that performs reception processing of control information communication channel processing means . 21. The terminal device according to claim 20, wherein the control information communication channel processing means receives a broadcast channel based on random number information obtained by receiving a frequency channel in which an initial acquisition channel exists. A terminal device that determines a frequency channel or time slot to be used and performs reception processing of the determined frequency channel or time slot. 22. The terminal device according to claim 20, wherein all frequency channels in which the initial acquisition channel exists are controlled by information indicating an appearance frequency obtained by receiving a frequency channel in which the initial acquisition channel exists. A terminal device determined by the processing means of the information communication channel. 23. The terminal device according to claim 20, wherein a plurality of subcarrier signals in one frequency channel are received by the information communication channel processing means and the control information communication channel processing means. Then, a terminal device that performs a process of demodulating the information dispersed and modulated into the plurality of subcarrier signals.